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A Doppler dimming determination of coronal outflow velocityOutflow velocities in a polar coronal hole are derived from observations made during a 1982 sounding rocket flight. The velocity results are derived from a Doppler dimming analysis of resonantly scattered H I Ly-alpha. This analysis indicates radial outflow velocities of 217 km/s at 2 solar radii from sun-center with an uncertainty range of 153 to 251 km/s at a confidence level of 67 percent. These results are best characterized as strong evidence for supersonic outflow within 2 solar radii of sun-center in a polar coronal hole. Several means for obtaining improved accuracy in future observations are discussed.
Document ID
19930062338
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Strachan, Leonard
(NASA Headquarters Washington, DC United States)
Kohl, John L.
(NASA Headquarters Washington, DC United States)
Weiser, Heinz
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Withbroe, George L.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; NASA Washington, United States)
Munro, Richard H.
(Ball Aerospace Systems Group Boulder, CO, United States)
Date Acquired
August 16, 2013
Publication Date
July 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 412
Issue: 1
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
93A46335
Funding Number(s)
CONTRACT_GRANT: NAG5-613
CONTRACT_GRANT: NASA ORDER W-13998
Distribution Limits
Public
Copyright
Other

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